When comparing Mozilla Firefox vs Polarity Browser, the Slant community recommends Mozilla Firefox for most people. In the question“What are the best desktop web browsers?”Mozilla Firefox is ranked 1st while Polarity Browser is ranked 10th. The most important reason people chose Mozilla Firefox is:

Pros

Pro

Strong HTML5 feature support

Pro

Free, open source and community driven

Firefox is available as a free download. All Mozilla software is licensed under the Mozilla Public License. Instructions on how to obtain the source code can be found here.

Pro

Syncs between devices

Firefox Sync is an optional feature in Firefox that allows syncing bookmarks, passwords, and add-ons between devices.

Pro

Awesome customizability

Pro

Automatically updated

Firefox is automatically updated on the platforms where it makes sense.

Pro

Strong developer tool

The built-in developer tools have been merged with the popular FireBug extension since FF57

Pro

Reader View

Reader View in Firefox allows users to read an article without any distractions by removing ads, unrelated elements and other distractive objects (similar to Microsoft Edge's Reading Mode and Safari's reader mode).

Pro

Good font rasterizing

Font rasterizing on Windows is much better than in competitors. Even smaller text is clear and contrast.

Pro

Ethical and pragmatic company mission

The Mozilla Manifesto outlines the company's mission and principles. Paraphrasing, they want the Internet to be a free and open resource, and to enable individuals to get the best use of that resource. They do this by creating open source software to which anyone may contribute, so long as such contributions fit with their principles (both ethical and technical).

Pro

Fast bookmark management

In order to add an open page to the bookmark bar, the tab can be dragged down and is added immediately.

Pro

Tagging bookmarks

Firefox is one of the few browsers that you can tag your bookmarks. You can view a list of tags and can search your bookmarks in the address bar with tags.

Pro

Lower memory fingerprint than competitors

Firefox used to be a trailer in memory usage, but as of 2017 it's less hungry for memory than competitors like Edge, Chrome, Safari and Opera.

Pro

High performance

The Firefox Quantum update (FF57) greatly increases the render speed and general performance of the browser, by taking better advantage of the user's hardware.

Pro

Integration with Pocket

Firefox comes with build-in Pocket integration that can allow users to quickly save the article for a read it later function to easily find any articles saved in Pocket from various sources and devices.

Pro

Use Less Resource

Pro

Easy screenshots without extensions

Within the browser itself, you can easily take screenshots and save them to your computer.

Pro

Text-to-speech (with adjustable speed) without add-ons

Firefox Reader Mode includes Narrate, a feature that adds text-to-speech functionality to the browser.

Pro

Fast and lightweight

According to their own tests Polarity takes up more than 10x less memory than IE, FF or Chrome.

Pro

Built-in privacy features

Polarity browser comes with ad block and Do Not Track built in.

Pro

Customizable UI

It allows you to customize many things from window color, tab color and text color to window transparency and border size. You can set Background image or use Shuffle from Bing. You can also save the theme, import and export it.

Pro

Custom Developer tools

Polarity comes with the standard Inspector for Blink based browsers along with its custom client that works with both Trident and Blink.

Pro

Multi-session browsing with Parallel Sessions

Parallel Sessions allows users to browse the web with different profiles with separate cache, cookies, and history. This enables users to login to multiple accounts to different websites like Facebook.

Pro

Great HTML5 support

Polarity scores 512/555 on the HTML5 test. It is just a couple of points shy of Google Chrome.

Cons

Con

Unstable add-ons

E10s has already caused many extensions to not work properly. Also, in November, only add-ons with WebExtension API can be installed.

Con

Installing some extensions still requires restarting the browser

While some of the developers already allow users to install their extensions without the need to restart the browser, not all of the extensions have been updated to support non-restart installation yet, as some developers have yet to add special code to do so.

Con

Slow performance in OS X

Uses a lot of resources and feels slower than the Linux and Windows versions.

Con

No support for ALSA since version 52

You must use PulseAudio if you need sound in Firefox.

Con

Heavy and consumes a lot of memory

Mozilla developers should think on this as the new Microsoft Edge browser steals less memory and it just pops up the moment you open it. In the case of Mozilla, you have to wait for after clicking it for opening it.

Con

It's bloated

Just remember that Firefox was created to create a simple and fast browser that would focus on web browsing. However, nowadays Mozilla is adding more and more extensions like pocket or screenshots to the browser(that could easily be done as optional add-ons) that will bloat it just like the old Mozilla Suite (nowadays Seamonkey).

Con

Sometimes stop working for few seconds

Sometimes stop working for 10/15 seconds, then starts working again. Inconvenient when looking streaming video on youtube or twitch

Con

Uses GTK on Linux/BSD

thus make the integration on non-GTK Desktop Environemnts very hard

Con

Poor enterprise support

Does not use standard management tools such as GPO or Profile management. No MSI.

Con

Styles HTML-forms with the OS/Desktop theme

At least on X11/Unix that leads to terrible issues, that makes some websites simply unusable for example: If you use a dark GTK theme that uses white text and come to a webpage that forces black text on html-forms buttons you will get black buttons with unreadable black text.

Con

Updates not in sync with updates of (key) extensions

A key extension can suddenly becomes useless because extension updates tend to fall behind the updates of Firefox.

Con

Windows and Android only

No Linux, OSX or iOS version available.

Con

Unstable and frequent crashes

Though the browser is really lightweight and lightning fast, it crashes many times and is clearly unstable.

Con

Uninstallation problems

Polarity browser can only be uninstalled with a built-in deinstallation tool. This is very impractical.

Con

Few annoyances left unchecked

The browser has a couple of bugs such as where extensions are not actually ran after installation despite a notification stating that they are.